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    <title>1、浏览器</title>
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    <h3>浏览器组成</h4>
    <h4>shell & 内核</h5>
    <p>Google Chrome   webkit/blink</p>
    <p>Safari          webkit</p>
    <p>firefox         gecko</p>
    <p>IE              trident</p>
    <p>opera           presto</p>

    <h4>内核：渲染rendering引擎/JS引擎</h5>

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